A fluent validation library for .NET
Express your valiation rules in a clear, concise manner:
Ensure(x => x.SomeProperty.MeetsSomeRule());
When(x => x.SomeProperty.MeetsSomeRule(), () => {
Ensure(x => x.OtherProperty.MeetsSomeRule());
});
When using conditionals, should the when clause fail, no error messages are set for the when clause.
Ensure(x => x.SomeProperty.MeetsSomeRule()).And(() => {
Ensure(x => x.OtherProperty.MeetsSomeRule());
});
This case is useful when you have two rules for a property, except that if the first rule fails, the 2nd rule is not run. An example usage of this would be checking an email address. You want to check that it is not empty, and that its a valid email. You wouldnt want two error messages in the "empty" case.
public class TestViewModel
{
public string Email { get; set; }
public string Password { get; set; }
public string ConfirmPassword { get; set; }
}
public class TestViewModelValidator : Validator<TestViewModel>
{
protected override void Rules()
{
Ensure(x => x.Email.IsNotNullOrEmpty()).And(()=>
Ensure(x => x.Email.IsAValidEmailAddress()));
Ensure(x => x.Password.IsNotNullOrEmpty()).And(() =>
Ensure(x => x.ConfirmPassword.IsEqualTo(x.Password)));
}
}